Speaking of Depeche, came across this DVD ..
Depeche Mode Rewind: 30 years at the edge totally unauthorised by ver Mode although, perhaps more interstingly,
"Other artists are featured, including ‘80s greats Thomas Dolby and Gary Numan, who provide a wealth of information about the genesis of electronic music.... Dolby and Numan extensively relate their vast knowledge of music history and the mechanics of creating music, which might appeal to hard-core music enthusiasts, but is not likely to entertain a general audience."
- might be worth looking into then.
